Polynesian post offices offer the same kinds of services as you would find in your home country and are generally open Monday to Friday from 7 a.m. to 3 p.m. Mail sent to Europe and the U.S.A. will reach its destination within 8 to 15 days.
Note that apart from Papeete, the mail is not individually distributed in French Polynesia. We use the P.O. boxes of our neighbouring post office.